The main advantage of the membrane valve is that its operating mechanism is separated from the medium passage, which not only ensures the purity of the working medium, but also prevents the medium in the pipe from impacting the working parts of the operating mechanism. In addition, the stem does not require any form of separate seal unless it is used as a safety feature in the control of hazardous materials. In diaphragm valves, because the working medium contacts only the diaphragm and the valve body, and both can use a variety of different materials, the valve ideally controls a wide range of working media, especially for applications with chemically aggressive or suspended particles medium. The working temperature of the British standard diaphragm valve is usually limited by the materials used for the diaphragm and the valve body lining. Its working temperature range is about -50 to 175 degrees. Diaphragm valve structure is simple, only by the valve body, diaphragm and valve cover assembly of the three main components. The valve is easy to disassemble and repair quickly, replacing the diaphragm can be done on site and in a short time. Separating the actuator from the media path makes the diaphragm valve suitable not only for food and medical and industrial hygiene but also for difficult to transport and hazardous media. A variety of synthetic elastomers and engineering plastics, as well as the wider choice of body lining materials, make diaphragm valves widely used in all areas of modern industry. Diaphragm valve classification Diaphragm valve according to the structure can be divided into: house, DC, cut-off, straight-through, ram and right-angle six; connection is usually flanged; driven by the manual can be divided into electric and Pneumatic three, of which pneumatic drive is divided into normally open, normally closed and reciprocating three.
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